ACSR for substation jumpers
ACSR for substation jumpers
(OP)
A 400 kV SS contractor wants to use spared ACSR for equipment and bay jumpers, I have doubts that the ACSR will not be maneuverable as AAC for this purpose, is there any figure to make this feeling mathematically sensible? e.g. minimum bending radius, stiffness, lateral stiffness, birdcaging limit,...etc.






RE: ACSR for substation jumpers
Some precautions are required in jumper connections. Let me narrate two incidents.
Some 30 years back, HV (220 KV ) bushing failures were reported on a 600 MVA GSU bank. Upper porcelain cracked and bushing had to be replaced. These were RIP( resin impregnated condenser bushings, first time being used in India)Since these were dry type bushings with out oil, bushing failure did not cause a transformer fire. The cause of failure was that the jumper connection was without sag and connected to the middle of the conductor catenary. During wind or short circuit current flow, catenary jumped and oscillated, causing excessive pull on the bushing. When the jumper connection was shifted to one end of catenary problem disappeared.
In another case 400 KV bushing exploded in a large inter connecting auto- transformer (ICT). The jumper connection to bushing was made in hot summer at 45C with out sufficient sag. When winter came, one early morning, at 2C ambient, bushing failed tripping the transformer.
RE: ACSR for substation jumpers
RE: ACSR for substation jumpers